blob: 0c02a09bc3514c0860aa9ff4a56066f31a37a78a [file] [log] [blame]
Tom Herbert65d7ab82015-08-17 13:42:27 -07001#include <linux/errno.h>
2#include <linux/ip.h>
3#include <linux/kernel.h>
4#include <linux/module.h>
5#include <linux/skbuff.h>
6#include <linux/socket.h>
7#include <linux/types.h>
8#include <net/checksum.h>
Tom Herbert79ff2fc2016-10-14 11:25:37 -07009#include <net/dst_cache.h>
Tom Herbert65d7ab82015-08-17 13:42:27 -070010#include <net/ip.h>
11#include <net/ip6_fib.h>
Tom Herbert79ff2fc2016-10-14 11:25:37 -070012#include <net/ip6_route.h>
Tom Herbert65d7ab82015-08-17 13:42:27 -070013#include <net/lwtunnel.h>
14#include <net/protocol.h>
15#include <uapi/linux/ila.h>
Tom Herbert33f11d12015-12-15 15:41:35 -080016#include "ila.h"
Tom Herbert65d7ab82015-08-17 13:42:27 -070017
Tom Herbert79ff2fc2016-10-14 11:25:37 -070018struct ila_lwt {
19 struct ila_params p;
20 struct dst_cache dst_cache;
21 u32 connected : 1;
22};
23
24static inline struct ila_lwt *ila_lwt_lwtunnel(
25 struct lwtunnel_state *lwt)
Tom Herbert65d7ab82015-08-17 13:42:27 -070026{
Tom Herbert79ff2fc2016-10-14 11:25:37 -070027 return (struct ila_lwt *)lwt->data;
28}
29
30static inline struct ila_params *ila_params_lwtunnel(
31 struct lwtunnel_state *lwt)
32{
33 return &ila_lwt_lwtunnel(lwt)->p;
Tom Herbert65d7ab82015-08-17 13:42:27 -070034}
35
Eric W. Biedermanede20592015-10-07 16:48:47 -050036static int ila_output(struct net *net, struct sock *sk, struct sk_buff *skb)
Tom Herbert65d7ab82015-08-17 13:42:27 -070037{
Tom Herbert79ff2fc2016-10-14 11:25:37 -070038 struct dst_entry *orig_dst = skb_dst(skb);
Tom Herbertab3a70b2016-10-16 21:25:35 -070039 struct rt6_info *rt = (struct rt6_info *)orig_dst;
Tom Herbert79ff2fc2016-10-14 11:25:37 -070040 struct ila_lwt *ilwt = ila_lwt_lwtunnel(orig_dst->lwtstate);
41 struct dst_entry *dst;
42 int err = -EINVAL;
Tom Herbert65d7ab82015-08-17 13:42:27 -070043
44 if (skb->protocol != htons(ETH_P_IPV6))
45 goto drop;
46
Tom Herbert79ff2fc2016-10-14 11:25:37 -070047 ila_update_ipv6_locator(skb, ila_params_lwtunnel(orig_dst->lwtstate),
48 true);
Tom Herbert65d7ab82015-08-17 13:42:27 -070049
Tom Herbertab3a70b2016-10-16 21:25:35 -070050 if (rt->rt6i_flags & (RTF_GATEWAY | RTF_CACHE)) {
51 /* Already have a next hop address in route, no need for
52 * dest cache route.
53 */
54 return orig_dst->lwtstate->orig_output(net, sk, skb);
55 }
56
Tom Herbert79ff2fc2016-10-14 11:25:37 -070057 dst = dst_cache_get(&ilwt->dst_cache);
58 if (unlikely(!dst)) {
59 struct ipv6hdr *ip6h = ipv6_hdr(skb);
60 struct flowi6 fl6;
61
62 /* Lookup a route for the new destination. Take into
63 * account that the base route may already have a gateway.
64 */
65
66 memset(&fl6, 0, sizeof(fl6));
67 fl6.flowi6_oif = orig_dst->dev->ifindex;
68 fl6.flowi6_iif = LOOPBACK_IFINDEX;
69 fl6.daddr = *rt6_nexthop((struct rt6_info *)orig_dst,
70 &ip6h->daddr);
71
72 dst = ip6_route_output(net, NULL, &fl6);
73 if (dst->error) {
74 err = -EHOSTUNREACH;
75 dst_release(dst);
76 goto drop;
77 }
78
79 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
80 if (IS_ERR(dst)) {
81 err = PTR_ERR(dst);
82 goto drop;
83 }
84
85 if (ilwt->connected)
86 dst_cache_set_ip6(&ilwt->dst_cache, dst, &fl6.saddr);
87 }
88
89 skb_dst_set(skb, dst);
90 return dst_output(net, sk, skb);
Tom Herbert65d7ab82015-08-17 13:42:27 -070091
92drop:
93 kfree_skb(skb);
stephen hemminger9e7b19c2017-05-19 09:55:49 -070094 return err;
Tom Herbert65d7ab82015-08-17 13:42:27 -070095}
96
97static int ila_input(struct sk_buff *skb)
98{
99 struct dst_entry *dst = skb_dst(skb);
Tom Herbert65d7ab82015-08-17 13:42:27 -0700100
101 if (skb->protocol != htons(ETH_P_IPV6))
102 goto drop;
103
Tom Herbert707a2ca2016-06-07 16:09:44 -0700104 ila_update_ipv6_locator(skb, ila_params_lwtunnel(dst->lwtstate), false);
Tom Herbert65d7ab82015-08-17 13:42:27 -0700105
Jiri Benc61adedf2015-08-20 13:56:25 +0200106 return dst->lwtstate->orig_input(skb);
Tom Herbert65d7ab82015-08-17 13:42:27 -0700107
108drop:
109 kfree_skb(skb);
110 return -EINVAL;
111}
112
stephen hemminger6501f342016-08-31 15:20:51 -0700113static const struct nla_policy ila_nl_policy[ILA_ATTR_MAX + 1] = {
Tom Herbert65d7ab82015-08-17 13:42:27 -0700114 [ILA_ATTR_LOCATOR] = { .type = NLA_U64, },
Tom Herbert90bfe662016-04-23 11:46:57 -0700115 [ILA_ATTR_CSUM_MODE] = { .type = NLA_U8, },
Tom Herbert65d7ab82015-08-17 13:42:27 -0700116};
117
David Ahern30357d72017-01-30 12:07:37 -0800118static int ila_build_state(struct nlattr *nla,
Tom Herbert127eb7c2015-08-24 09:45:41 -0700119 unsigned int family, const void *cfg,
David Ahern9ae28722017-05-27 16:19:28 -0600120 struct lwtunnel_state **ts,
121 struct netlink_ext_ack *extack)
Tom Herbert65d7ab82015-08-17 13:42:27 -0700122{
Tom Herbert79ff2fc2016-10-14 11:25:37 -0700123 struct ila_lwt *ilwt;
Tom Herbert65d7ab82015-08-17 13:42:27 -0700124 struct ila_params *p;
125 struct nlattr *tb[ILA_ATTR_MAX + 1];
Tom Herbert65d7ab82015-08-17 13:42:27 -0700126 struct lwtunnel_state *newts;
Tom Herbert92b78af2015-08-24 09:45:42 -0700127 const struct fib6_config *cfg6 = cfg;
Tom Herbert351596a2016-04-23 11:46:55 -0700128 struct ila_addr *iaddr;
Tom Herbert65d7ab82015-08-17 13:42:27 -0700129 int ret;
130
Tom Herbert92b78af2015-08-24 09:45:42 -0700131 if (family != AF_INET6)
132 return -EINVAL;
133
Tom Herbert79ff2fc2016-10-14 11:25:37 -0700134 if (cfg6->fc_dst_len < 8 * sizeof(struct ila_locator) + 3) {
Tom Herbert351596a2016-04-23 11:46:55 -0700135 /* Need to have full locator and at least type field
136 * included in destination
137 */
138 return -EINVAL;
139 }
140
141 iaddr = (struct ila_addr *)&cfg6->fc_dst;
142
Tom Herbert90bfe662016-04-23 11:46:57 -0700143 if (!ila_addr_is_ila(iaddr) || ila_csum_neutral_set(iaddr->ident)) {
144 /* Don't allow translation for a non-ILA address or checksum
145 * neutral flag to be set.
146 */
Tom Herbert351596a2016-04-23 11:46:55 -0700147 return -EINVAL;
148 }
149
David Ahern9ae28722017-05-27 16:19:28 -0600150 ret = nla_parse_nested(tb, ILA_ATTR_MAX, nla, ila_nl_policy, extack);
Tom Herbert65d7ab82015-08-17 13:42:27 -0700151 if (ret < 0)
152 return ret;
153
154 if (!tb[ILA_ATTR_LOCATOR])
155 return -EINVAL;
156
Thomas Graff76a9db2016-10-21 16:10:22 +0200157 newts = lwtunnel_state_alloc(sizeof(*ilwt));
Tom Herbert65d7ab82015-08-17 13:42:27 -0700158 if (!newts)
159 return -ENOMEM;
160
Tom Herbert79ff2fc2016-10-14 11:25:37 -0700161 ilwt = ila_lwt_lwtunnel(newts);
162 ret = dst_cache_init(&ilwt->dst_cache, GFP_ATOMIC);
163 if (ret) {
164 kfree(newts);
165 return ret;
166 }
167
Tom Herbert65d7ab82015-08-17 13:42:27 -0700168 p = ila_params_lwtunnel(newts);
169
Tom Herbert351596a2016-04-23 11:46:55 -0700170 p->locator.v64 = (__force __be64)nla_get_u64(tb[ILA_ATTR_LOCATOR]);
Tom Herbert65d7ab82015-08-17 13:42:27 -0700171
Tom Herbert351596a2016-04-23 11:46:55 -0700172 /* Precompute checksum difference for translation since we
173 * know both the old locator and the new one.
174 */
175 p->locator_match = iaddr->loc;
176 p->csum_diff = compute_csum_diff8(
177 (__be32 *)&p->locator_match, (__be32 *)&p->locator);
Tom Herbert92b78af2015-08-24 09:45:42 -0700178
Tom Herbert90bfe662016-04-23 11:46:57 -0700179 if (tb[ILA_ATTR_CSUM_MODE])
180 p->csum_mode = nla_get_u8(tb[ILA_ATTR_CSUM_MODE]);
181
182 ila_init_saved_csum(p);
183
Tom Herbert65d7ab82015-08-17 13:42:27 -0700184 newts->type = LWTUNNEL_ENCAP_ILA;
185 newts->flags |= LWTUNNEL_STATE_OUTPUT_REDIRECT |
186 LWTUNNEL_STATE_INPUT_REDIRECT;
187
Tom Herbert79ff2fc2016-10-14 11:25:37 -0700188 if (cfg6->fc_dst_len == 8 * sizeof(struct in6_addr))
189 ilwt->connected = 1;
190
Tom Herbert65d7ab82015-08-17 13:42:27 -0700191 *ts = newts;
192
193 return 0;
194}
195
Tom Herbert79ff2fc2016-10-14 11:25:37 -0700196static void ila_destroy_state(struct lwtunnel_state *lwt)
197{
198 dst_cache_destroy(&ila_lwt_lwtunnel(lwt)->dst_cache);
199}
200
Tom Herbert65d7ab82015-08-17 13:42:27 -0700201static int ila_fill_encap_info(struct sk_buff *skb,
202 struct lwtunnel_state *lwtstate)
203{
204 struct ila_params *p = ila_params_lwtunnel(lwtstate);
205
Tom Herbert351596a2016-04-23 11:46:55 -0700206 if (nla_put_u64_64bit(skb, ILA_ATTR_LOCATOR, (__force u64)p->locator.v64,
Nicolas Dichtelf13a82d2016-04-25 10:25:16 +0200207 ILA_ATTR_PAD))
Tom Herbert65d7ab82015-08-17 13:42:27 -0700208 goto nla_put_failure;
Tom Herbert1ddb6b72016-05-10 11:56:32 +0200209 if (nla_put_u8(skb, ILA_ATTR_CSUM_MODE, (__force u8)p->csum_mode))
Tom Herbert90bfe662016-04-23 11:46:57 -0700210 goto nla_put_failure;
Tom Herbert65d7ab82015-08-17 13:42:27 -0700211
212 return 0;
213
214nla_put_failure:
215 return -EMSGSIZE;
216}
217
218static int ila_encap_nlsize(struct lwtunnel_state *lwtstate)
219{
Tom Herbert1ddb6b72016-05-10 11:56:32 +0200220 return nla_total_size_64bit(sizeof(u64)) + /* ILA_ATTR_LOCATOR */
221 nla_total_size(sizeof(u8)) + /* ILA_ATTR_CSUM_MODE */
222 0;
Tom Herbert65d7ab82015-08-17 13:42:27 -0700223}
224
225static int ila_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
226{
227 struct ila_params *a_p = ila_params_lwtunnel(a);
228 struct ila_params *b_p = ila_params_lwtunnel(b);
229
Tom Herbert351596a2016-04-23 11:46:55 -0700230 return (a_p->locator.v64 != b_p->locator.v64);
Tom Herbert65d7ab82015-08-17 13:42:27 -0700231}
232
233static const struct lwtunnel_encap_ops ila_encap_ops = {
234 .build_state = ila_build_state,
Tom Herbert79ff2fc2016-10-14 11:25:37 -0700235 .destroy_state = ila_destroy_state,
Tom Herbert65d7ab82015-08-17 13:42:27 -0700236 .output = ila_output,
237 .input = ila_input,
238 .fill_encap = ila_fill_encap_info,
239 .get_encap_size = ila_encap_nlsize,
240 .cmp_encap = ila_encap_cmp,
Robert Shearman88ff7332017-01-24 16:26:47 +0000241 .owner = THIS_MODULE,
Tom Herbert65d7ab82015-08-17 13:42:27 -0700242};
243
Tom Herbert33f11d12015-12-15 15:41:35 -0800244int ila_lwt_init(void)
Tom Herbert65d7ab82015-08-17 13:42:27 -0700245{
246 return lwtunnel_encap_add_ops(&ila_encap_ops, LWTUNNEL_ENCAP_ILA);
247}
248
Tom Herbert33f11d12015-12-15 15:41:35 -0800249void ila_lwt_fini(void)
Tom Herbert65d7ab82015-08-17 13:42:27 -0700250{
251 lwtunnel_encap_del_ops(&ila_encap_ops, LWTUNNEL_ENCAP_ILA);
252}